swiotlb_del_transient(9)

💅 swiotlb_del_transient (9) — Kernel API Manual 🎀

okay so bestie, we're in the Kernel API Manual today and the star of the show is swiotlb_del_transient ✨ it's a little function that's like "hey, is this address part of a transient memory pool? if yes, delete it, bye 💅" — honestly iconic behavior, no cap.

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🌸 NAME 🌸

swiotlb_del_transient — delete a transient memory pool 🗑️✨

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🦋 SYNOPSIS 🦋

bool swiotlb_del_transient (struct device *dev , phys_addr_t tlb_addr ,
       struct io_tlb_pool *pool );

returns a bool, takes three args, that's the whole vibe 💖

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🎀 ARGUMENTS 🎀

• dev — the struct device * that mapped the buffer, like the main character of this whole situation 🫶
• tlb_addr — a phys_addr_t, and it's the physical address sitting inside a bounce buffer 📍
• pool — a pointer to the transient memory pool that's gonna get checked and then (spoiler 🫢) deleted, struct io_tlb_pool * energy 💀

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👑 DESCRIPTION 👑

so what it does is literally this: it checks whether the address actually belongs to a transient SWIOTLB memory pool 🧚 and if yes?? then it deletes the pool. periodt. that's the lore 💅

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⭐ RETURN ⭐

it returns true if tlb_addr belonged to a transient pool that was released 🎉 (so like, true = we found it and let it go, false = not our girl 🙈)

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🌈 SEE ALSO 🌈

buckle up bestie, this is a long one 🫶 the kernel file lives at ./kernel/dma/swiotlb.c and it's giving family reunion:

• struct io_tlb_slot(9)
• struct io_tlb_area(9)
• swiotlb_adjust_nareas(9)
• limit_nareas(9)
• add_mem_pool(9)
• alloc_dma_pages(9)
• swiotlb_alloc_tlb(9)
• swiotlb_free_tlb(9)
• swiotlb_alloc_pool(9)
• swiotlb_dyn_alloc(9)
• __swiotlb_find_pool(9)
• swiotlb_del_pool(9)
• swiotlb_dev_init(9)
• swiotlb_align_offset(9)
• swiotlb_search_pool_area(9)
• swiotlb_search_area(9)
• swiotlb_find_slots(9)
• mem_pool_used(9)
• mem_used(9)
• swiotlb_tbl_map_single(9)
• is_swiotlb_allocated(9)
• default_swiotlb_base(9)
• default_swiotlb_limit(9)

like I said. whole friend group. iykyk 💖

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fr fr don't sleep on reading those, they're all lowkey part of the same story 🦋

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and that's the page!! 🎀 brought to you from ./kernel/dma 🌸 dated October 2026 ⭐ and yeah the page is literally called swiotlb_del_transient(9) — mwah, slay, goodbye bestie 💜✨